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GLCOPYCOLORTABLE(3G)		 OpenGL Manual		  GLCOPYCOLORTABLE(3G)

NAME
       glCopyColorTable - copy pixels into a color table

C SPECIFICATION
       void glCopyColorTable(GLenum target, GLenum internalformat, GLint x,
			     GLint y, GLsizei width);

PARAMETERS
       target
	   The color table target. Must be GL_COLOR_TABLE,
	   GL_POST_CONVOLUTION_COLOR_TABLE, or
	   GL_POST_COLOR_MATRIX_COLOR_TABLE.

       internalformat
	   The internal storage format of the texture image. Must be one of
	   the following symbolic constants: GL_ALPHA, GL_ALPHA4, GL_ALPHA8,
	   GL_ALPHA12, GL_ALPHA16, GL_LUMINANCE, GL_LUMINANCE4, GL_LUMINANCE8,
	   GL_LUMINANCE12, GL_LUMINANCE16, GL_LUMINANCE_ALPHA,
	   GL_LUMINANCE4_ALPHA4, GL_LUMINANCE6_ALPHA2, GL_LUMINANCE8_ALPHA8,
	   GL_LUMINANCE12_ALPHA4, GL_LUMINANCE12_ALPHA12,
	   GL_LUMINANCE16_ALPHA16, GL_INTENSITY, GL_INTENSITY4, GL_INTENSITY8,
	   GL_INTENSITY12, GL_INTENSITY16, GL_R3_G3_B2, GL_RGB, GL_RGB4,
	   GL_RGB5, GL_RGB8, GL_RGB10, GL_RGB12, GL_RGB16, GL_RGBA, GL_RGBA2,
	   GL_RGBA4, GL_RGB5_A1, GL_RGBA8, GL_RGB10_A2, GL_RGBA12, or
	   GL_RGBA16.

       x
	   The x coordinate of the lower-left corner of the pixel rectangle to
	   be transferred to the color table.

       y
	   The y coordinate of the lower-left corner of the pixel rectangle to
	   be transferred to the color table.

       width
	   The width of the pixel rectangle.

DESCRIPTION
       glCopyColorTable loads a color table with pixels from the current
       GL_READ_BUFFER (rather than from main memory, as is the case for
       glColorTable()).

       The screen-aligned pixel rectangle with lower-left corner at (x,\ y)
       having width width and height 1 is loaded into the color table. If any
       pixels within this region are outside the window that is associated
       with the GL context, the values obtained for those pixels are
       undefined.

       The pixels in the rectangle are processed just as if glReadPixels()
       were called, with internalformat set to RGBA, but processing stops
       after the final conversion to RGBA.

       The four scale parameters and the four bias parameters that are defined
       for the table are then used to scale and bias the R, G, B, and A
       components of each pixel. The scale and bias parameters are set by
       calling glColorTableParameter().

       Next, the R, G, B, and A values are clamped to the range 0 1. Each
       pixel is then converted to the internal format specified by
       internalformat. This conversion simply maps the component values of the
       pixel (R, G, B, and A) to the values included in the internal format
       (red, green, blue, alpha, luminance, and intensity). The mapping is as
       follows:

       ┌─────────────────────────────────┬─────────────────────────────┬───────────────────────────────┬──────────────────────────────┬───────────────────────────────┬───────────────────────────────────┬───────────────────────────────────┐
       │				 │			       │			       │			      │				      │					  │				      │
       │			Internal │			   Red │			 Green │			 Blue │				Alpha │				Luminance │			    Intensity │
       │Format				 │			       │			       │			      │				      │					  │				      │
       │				 │			       │			       │			      │				      │					  │				      │
       ├─────────────────────────────────┼─────────────────────────────┼───────────────────────────────┼──────────────────────────────┼───────────────────────────────┼───────────────────────────────────┼───────────────────────────────────┤
       │GL_ALPHA			 │			       │			       │			      │		      A		      │					  │				      │
       ├─────────────────────────────────┼─────────────────────────────┼───────────────────────────────┼──────────────────────────────┼───────────────────────────────┼───────────────────────────────────┼───────────────────────────────────┤
       │GL_LUMINANCE			 │			       │			       │			      │				      │			R		  │				      │
       ├─────────────────────────────────┼─────────────────────────────┼───────────────────────────────┼──────────────────────────────┼───────────────────────────────┼───────────────────────────────────┼───────────────────────────────────┤
       │GL_LUMINANCE_ALPHA		 │			       │			       │			      │		      A		      │			R		  │				      │
       ├─────────────────────────────────┼─────────────────────────────┼───────────────────────────────┼──────────────────────────────┼───────────────────────────────┼───────────────────────────────────┼───────────────────────────────────┤
       │GL_INTENSITY			 │			       │			       │			      │				      │					  │		    R		      │
       ├─────────────────────────────────┼─────────────────────────────┼───────────────────────────────┼──────────────────────────────┼───────────────────────────────┼───────────────────────────────────┼───────────────────────────────────┤
       │GL_RGB				 │		R	       │	       G	       │	      B		      │				      │					  │				      │
       ├─────────────────────────────────┼─────────────────────────────┼───────────────────────────────┼──────────────────────────────┼───────────────────────────────┼───────────────────────────────────┼───────────────────────────────────┤
       │GL_RGBA				 │		R	       │	       G	       │	      B		      │		      A		      │					  │				      │
       └─────────────────────────────────┴─────────────────────────────┴───────────────────────────────┴──────────────────────────────┴───────────────────────────────┴───────────────────────────────────┴───────────────────────────────────┘

       Finally, the red, green, blue, alpha, luminance, and/or intensity
       components of the resulting pixels are stored in the color table. They
       form a one-dimensional table with indices in the range 0 width - 1.

NOTES
       glCopyColorTable is available only if ARB_imaging is returned from
       calling glGetString() with an argument of GL_EXTENSIONS.

ERRORS
       GL_INVALID_ENUM is generated when target is not one of the allowable
       values.

       GL_INVALID_VALUE is generated if width is less than zero.

       GL_INVALID_VALUE is generated if internalformat is not one of the
       allowable values.

       GL_TABLE_TOO_LARGE is generated if the requested color table is too
       large to be supported by the implementation.

       GL_INVALID_OPERATION is generated if glCopyColorTable is executed
       between the execution of glBegin() and the corresponding execution of
       glEnd().

ASSOCIATED GETS
       glGetColorTable(), glGetColorTableParameter()

SEE ALSO
       glColorTable(), glColorTableParameter(), glReadPixels()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  04/29/2014		  GLCOPYCOLORTABLE(3G)

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